<!DOCTYPE html>
<html lang="en" xmlns:v-bind="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<div id="app">
<!--      <a v-bind:href="url">点击一下</aaa>-->
      <a :href="url">请点击一下</a>
      <input v-model = "username">
            {{username}}
    <input name="username" v-model="username" >
    {{username}}
</div>
<body>
<script src="js/vue.js"></script>
<script>
    new Vue({
        el:"#app",
        data() {
            return {
                username:"",
                url:"https://www.baidu.com"
            }
        }
    });
</script>
</body>
</html>